Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Interaction with VUV and X-ray light

A 35.15: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Time-resolved Measurement of Interatomic Coulombic Decay in Ne₂ at FLASH — •Kirsten Schnorr¹, Arne Senftleben¹, Moritz Kurka¹, Artem Rudenko², Lutz Foucar³, Georg Schmid¹, Thomas Pfeifer¹, Kristina Meyer¹, Denis Anielski¹, Rebecca Boll¹, Daniel Rolles⁴, Matthias Kübel⁵, Matthias Kling^2,5, Simona Scheit⁶, Vitaly Averbukh⁷, Joachim Ullrich⁸, Claus-Dieter Schröter¹, and Robert Moshammer¹ — ¹MPI für Kernphysik, Heidelberg — ²J.R. Macdonald Laboratory, Kansas — ³MPI für medizinische Forschung, Heidelberg — ⁴DESY, Hamburg — ⁵MPI für Quantenoptik, Garching — ⁶Goethe-Universität, Frankfurt — ⁷Imperial College, London — ⁸PTB, Braunschweig

Interatomic Coulombic Decay (ICD) is a radiationless decay mechanism in weakly bound systems, where an excited atom relaxes via an energy transfer to a van-der-Waals–bound neighbour, which then emits an electron. The process has been theoretically predicted and experimentally confirmed in clusters and molecules. The lifetime of ICD is a crucial parameter for understanding the underlying mechanism. Here, we present the first direct time-resolved measurement of an ICD lifetime, applying an XUV pump-probe scheme to the neon dimer Ne₂. A 58 eV pump pulse of approximately 60 fs length creates a 2s hole, initiating the decay process, which is probed after an adjustable time delay by an exact copy of the first pulse. Whether or not ICD has happened by the time the probe pulse impinges, leads to the population of different energy levels. The resulting fragmentation channels are separated by means of a Reaction Microscope.